What is the primary goal of having well-structured relations in a database?

To allow easier data duplication

What does an insertion anomaly in a database typically cause?

Simplification of data retrieval

Reduction of data inconsistencies

What is a general rule of thumb for structuring tables in a database?

A table should not pertain to more than one entity type

A table should contain multiple entity types

A table should allow unrestricted data modifications

A table should focus on maximizing data redundancy

Is the table shown in the image an example of a relation in database terminology?

Yes, because it has unique rows and no multivalued attributes.

No, because it contains duplicate rows.

No, because it includes multiple departments.

Yes, because it lists employee salaries.

What is an insertion anomaly as described in the image?

It is the inability to enter a new employee without having the employee take a class or having at least empty fields of class information.

It is the inability to delete a record without affecting other related data.

It is the requirement to update multiple records when a single data item changes.

It is the loss of information when a record is removed.

What happens if employee 140 is removed, according to the deletion anomaly mentioned in the image?

The existence of a Tax Acc class is lost.

A new employee cannot be added without class information.

All records of employee 140 are updated.

The system crashes due to lack of data.

What is a modification anomaly as described in the image?

It necessitates updating multiple records when giving a salary increase to an employee.

It requires a new employee to take a class.

It involves losing data related to other classes when an employee is removed.

It prevents the insertion of new data without complete information.

Why do the anomalies mentioned in the image exist?

Because there are two themes (entity types) in one relation, leading to data duplication and unnecessary dependency between the entities.

Because the data is stored in a single table.

Because there is only one type of entity involved.

Because the database is not normalized.

What is the first step in the normalization process according to the diagram?

Table with multivalued attributes

Remove multivalued dependencies

What is a functional dependency in database management?

A) A relationship where the value of one attribute determines the value of another attribute.

B) A unique identifier for database records.

D) A method to speed up database queries.

What is a candidate key?

C) Any attribute that can uniquely identify each record in a table.

A) A primary key used in all database tables.

B) A foreign key that links two tables.

D) A non-unique attribute that partially identifies table records.

Which of the following is true about candidate keys?

B) Each non-key field must be functionally dependent on every candidate key.

A) Only one candidate key can exist in a table.

C) Candidate keys cannot be composite keys.

D) Candidate keys are always numeric.

What is a requirement for a database to be in First Normal Form (1NF)?

All attributes must be multivalued

Only some relations need to be in 1NF

Every attribute value should be a set of values

Which of the following statements is true regarding First Normal Form?

Every attribute value must be atomic

Every attribute value must be composite

Only numeric attributes must be atomic

What does it imply if a figure is not in First Normal Form?

It is a fully normalized relation

What is the primary reason the table shown is not in 1st normal form?

It contains a composite primary key.

It includes derived attributes.

What does the table in the image represent in terms of database normalization?

A table with no multivalued attributes and unique rows, in 1st normal form

A table with multivalued attributes

A table in second normal form (2NF)

A table in third normal form (3NF)

Why does updating the price of product ID 4 in the database table cause issues?

It requires updates in multiple records

It does not affect other records

It requires updates in only one record

What is the primary reason for the anomalies mentioned in the table?

Multiple themes in one relation

What does Second Normal Form (2NF) require in addition to the conditions of the First Normal Form (1NF)?

Every non-key attribute must be functionally dependent on the entire primary key.

Every non-key attribute must be functionally dependent on any part of the primary key.

Every non-key attribute must be functionally independent of the primary key.

No non-key attribute should be functionally dependent on the primary key.

Which of the following is NOT allowed under Second Normal Form (2NF)?

Partial functional dependencies

Non-key attributes dependent on the entire primary key

Non-key attributes not dependent on any part of the primary key

According to the functional dependency diagram for INVOICE, which combination of attributes is necessary to determine OrderQuantity?

ProductID and ProductDescription

Based on the functional dependency diagram for INVOICE, which statement is true regarding the normalization of the INVOICE table?

It is in 1st Normal Form but not in 2nd Normal Form.

It is in 2nd Normal Form but not in 3rd Normal Form.

It is fully normalized up to 3rd Normal Form.

Normalization cannot be determined from the diagram.

What does the diagram in Figure 4-28 illustrate about database normalization?

Removal of partial dependencies to achieve 3NF

Conversion of a database schema to 1NF only

Illustration of transitive dependencies in 1NF

Process of denormalization from 3NF to 2NF

Database Normalization Quiz

Authored by Ahmed Dirie

Computers

12th Grade

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64 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of normalization in database design?

To increase data redundancy

To decrease data redundancy and improve data integrity

To simplify the user interface

To enhance the speed of transactions

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which normal form is primarily concerned with the elimination of duplicate data?

First Normal Form (1NF)

Second Normal Form (2NF)

Third Normal Form (3NF)

Fourth Normal Form (4NF)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the Second Normal Form (2NF) specifically address?

Removal of all duplicate data

Elimination of non-prime attribute dependencies on part of a candidate key

Elimination of transitive dependencies between attributes

Ensuring that all attributes depend on a unique identifier

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the context of database normalization, what is achieved by applying the Third Normal Form (3NF)?

Ensuring all non-key attributes are fully functional dependent on the primary key

Removing transitive dependencies among non-key attributes

Allowing partial dependencies within the table

Increasing data redundancy to speed up access

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary purpose of data normalization in database design?

To increase data redundancy

To validate and improve a logical design to satisfy certain constraints

To complicate the structure of the database

To increase processing time

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the process of data normalization help to avoid?

Necessary duplication of data

Unnecessary duplication of data

Data security

Data accessibility

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result of decomposing relations with anomalies in data normalization?

Larger, unstructured relations

Smaller, well-structured relations

Increased data anomalies

Decreased database functionality

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Database Normalization Quiz

What is the purpose of normalization in database design?

Which normal form is primarily concerned with the elimination of duplicate data?

What does the Second Normal Form (2NF) specifically address?

In the context of database normalization, what is achieved by applying the Third Normal Form (3NF)?

What is the primary purpose of data normalization in database design?

What does the process of data normalization help to avoid?

What is the result of decomposing relations with anomalies in data normalization?

What is the primary goal of having well-structured relations in a database?

What does an insertion anomaly in a database typically cause?

Which anomaly involves loss of necessary data due to deletion of rows in a database?

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